2001-12-02 02:13:35 +00:00
|
|
|
.\"
|
|
|
|
|
.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved.
|
|
|
|
|
.\"
|
|
|
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
|
|
|
.\" modification, are permitted provided that the following conditions
|
|
|
|
|
.\" are met:
|
|
|
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
|
|
|
.\" notice(s), this list of conditions and the following disclaimer as
|
|
|
|
|
.\" the first lines of this file unmodified other than the possible
|
|
|
|
|
.\" addition of one or more copyright notices.
|
|
|
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
|
|
|
.\" notice(s), this list of conditions and the following disclaimer in the
|
|
|
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
|
|
|
.\"
|
|
|
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
|
|
|
|
|
.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
|
|
|
.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
|
|
|
.\" DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
|
|
|
|
|
.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
|
|
|
.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
|
|
|
.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
|
|
|
.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
|
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
|
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
|
|
|
|
|
.\" DAMAGE.
|
|
|
|
|
.\"
|
|
|
|
|
.\" $FreeBSD$
|
|
|
|
|
.\"
|
|
|
|
|
.Dd July 30, 2001
|
|
|
|
|
.Dt VM_PAGE_DONTNEED 9
|
|
|
|
|
.Os
|
|
|
|
|
.Sh NAME
|
|
|
|
|
.Nm vm_page_dontneed
|
|
|
|
|
.Nd "indicate that a page is not needed anymore"
|
|
|
|
|
.Sh SYNOPSIS
|
|
|
|
|
.In sys/param.h
|
|
|
|
|
.In vm/vm.h
|
|
|
|
|
.In vm/vm_page.h
|
|
|
|
|
.Ft void
|
|
|
|
|
.Fn vm_page_dontneed "vm_page_t m"
|
|
|
|
|
.Sh DESCRIPTION
|
|
|
|
|
The
|
|
|
|
|
.Fn vm_page_dontneed
|
|
|
|
|
function advises the VM system that the given page is no longer
|
|
|
|
|
required.
|
2001-12-14 09:11:13 +00:00
|
|
|
If the page is already in the inactive queue or in the cache queue, this
|
2001-12-02 02:13:35 +00:00
|
|
|
function does nothing; otherwise the page is deactivated.
|
|
|
|
|
.Pp
|
|
|
|
|
Note that
|
|
|
|
|
.Fn vm_page_dontneed
|
|
|
|
|
does not necessarily deactivate a page, but instead implements an
|
|
|
|
|
algorithm that attempts to prevent small objects from having their
|
|
|
|
|
pages reused too quickly, and large objects from flushing smaller
|
|
|
|
|
ones from the queues as their pages are released.
|
|
|
|
|
.Sh SEE ALSO
|
|
|
|
|
.Xr vm_page_deactivate 9
|
|
|
|
|
.Sh AUTHORS
|
|
|
|
|
This manual page was written by
|
2014-06-26 21:44:30 +00:00
|
|
|
.An Chad David Aq Mt davidc@acns.ab.ca .
|
